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Mikey Santini was in junior high when he started taking creatine and protein supplements to build muscle and enhance his athletic abilities. By his junior year at Stevenson High School, he had moved on to nitric oxide "energy igniters" such as N.O.-Xplode and so-called "legal anabolic" products such as Mass FX, which claims to boost strength, aggression and testosterone levels. "You can get fabulous results," said Santini, 19, of Buffalo Grove, Illinois, who played soccer and ran cross country. But he acknowledges the products have a potentially dangerous downside. Some surveys show anabolic steroid use has decreased among adolescents over the last decade, but...

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Mikey Santini was in junior high when he started taking creatine and protein supplements to build muscle and enhance his athletic abilities. By his junior year at Stevenson High School, he had moved on to nitric oxide "energy igniters" such as...

Christian Marin hops over plastic hurdles and weaves through plastic cones as quickly as he can, but the only competition he sees is himself.
"I'm just trying to go faster than I did before," says Christian, 8.
His brother, Gabriel, 6, and his...